Joint for concrete slabs



Oct. 18, 1966 E. D. GARNER JOINT FOR CONCRETE SLABS Filed July 16, 1964 //v VE/V r012 E0 W/l/PD 0. GAA /YEQ 4770 NfK United States Patent "ice 3379335 Patented Oct. 18, 1966 stances and under different conditions. It will also be 3,279,335 understood that a joint structure 22 as shown is generally JOINT F OR CQNCRETE SLABS used on slabs that represent a half width of the complete Edward Garner, 5724 Seward St., Lincoln, Nebr. madway Fled July 1964 383,175 With a structure 22 placed on the road bed as de- 5 Claims (CL 94 8) scribed, runners 24 are anchored in place by hook members 46 that engage the runners and are driven into bed 10 and in this position, wires 44 may be removed or not as desired. Dowels 36 are also coated with a suitable lubricant as is well known to prevent them from bonding with the concrete and to permit expansion and contraction of the concrete, and in this regard, the supporting structure for the dowels afforded 'by the projections 34 and recesses 38 eliminates any external contact with the dowel that is present in other forms of joint structures and thereby avoids leaving any dowel areas where there is no lubricant. As a result, the dowels cannot become bonded to the concrete to reduce the effective results intended as This invention relates to a joint structure for concrete slabs and more particularly for use in forming the joint between adjacent slabs in the construction of roads, runways and the like. 10

Various types of joint structures are presently in use in road construction including the use of dowels which is employed with this invention and one of the important objects contemplated herein is the provision of an improved dowel type joint structure that is sturdier and more efficient than those presently in use.

More particularly it is an object of this invention to provide-a dowel type joint structure for concrete slabs frequently Occurs with some other p joints th-at 1s slmp 1e and easy to make and m-stau and (me whlch The concrete is poured over the structure 22 in acwill not break1 or collapse under the weight of wet concrete cordance with known practices and after it has hardened as it is poure i i To attain these objects and such further objects as may the lomthzo 1S forlmed by iconcrete.salfrom top f appear herein, or be hereinafter pointed out, reference is top of t P S 36 as est Seep m 101m 2 15 made to the accompanying drawings forming a part herethen fined with felt or tar 50 as Well known of in which: This joint structure 22 as described requires less ma- FIG 1 is a Perspective View showing a concrete Slab terial and less welding and fabrication than other joint joint Structure embodying this invention structures for the same purpose and the novel supporting FIG 2 is an enlarged transverse Section of a means for the dowels 36 as ndicated hasdemonstrated its joint between two concrete slabs showing my joint struc 3O superiority and greater efliciency for its intended purpose ture in operative position and over structures presently in general use. Thus, from the FIG. 3 is an enlarged sectional view of one end of one -29 1t 15 thought u P j' j the of the dowels showing its supporting structure in relation g' ii 2 i g of li g YQ d had and to the road bed rior to the ourin of the slab. e a van ages 0 e Same W1 6 apprecla e Referring to the drawings, a r ad bed or sub-grade is n It Will be understogd that Phraseology employed designated by the numeral 19 which is prepared 0 herein is for the purpose of description and not for limita- 14 :22 o a re erence t e res ective to an ottom su aces v v and The joint f, the Slabs 12 and 14 is in the scope of what is clalmed, without departing from fformgd after the concrete has set as will later be reg; g g g t gggg g g g erre to.

w reference now more particularly to FIGS 2 and 3, mechanical equivalents which may be reasonably included this joint structure 22 includes a pair of parallel spaced l l Scope angle iron runners or supports 24, to each of which there 0 are secured, prefgrably by Welding, he longitudinally 1. in a oint structure for ad acent concrete slabs, the spaced and oppositely disposed upstanding support rods combufatlgn of: d n 1 26. As best seen in FIG. 3, each rod 26 extends upwarda P Space P F runners ly from runners 24 to point 28 where it is bent towards the a Plurahty of Ppsjandmg 191 t rods Secured to and opposite like rod 26 to form a supporting shoulder 30 and 5 3 gitud nally on each runneg I then extends upwardly to point 32 where it is agaln bent To iemlmatmg lts top a horizontal P l toward the opposite rod 26 to terminate 1n the horizontally exlendlng toward but not the f' runnPr p g a a a; star: J22.12555;aathzaassss o oppose ro s 2 serve to support a owe mem er c by nesting in a respective socket or recess 38 provided in a Plurahty of dowels each Provlded Wlth a recess each end of each dowel. This arrangement providesa g g enci, t d b f t most efficient and sturdy support for the dowels and W111 d ia h PP 3 f3 ;d P Y P 0 PPP i1 not break or collapse as frequently occurs in other forms To 5 Y avlng one 0 S31 prolectlons nested 111 63c of joint structure having different dowel supporting means. recess b Rods 26 are further braced by the respective elongated R f fi meaI 1S etween Opposed rods for malnrods 40 which connect the several rods 26 on each reta1n1ng t e jermmal ends of Opposed Tod pp spective runner 24 and which are welded 4 2 to the top of 2 Z SEV}; g d ii szz fi-n cla m 1 n 1 d the respective shoulders 30. 1 1 1 1 c 11 55 For ease and convenience in handling structure 22 until anchonng d' g fi to I: roadbed whereby it is in place, rods 40 are preferably tied together in any :22 a f lit i tgi ti rim l s sn s gg o g fe g i s suitable manner such as by the wire strands 44. It can 65 suggorts Seated in Said recess so that said lzem Ora thus be easily placed on theroad bed 10 where runners 1 1 b P 24 are tarnsverse to the longitudinal axis of the road and he means 6am 5e ectlve Y e removed 0 r talned 1n dowels 36 will be parallel with such axis. Preferably P dowels 35 an; approximately one foot apart and an n- 3. A deVlCfi HS defined 11'1 claim 2 wherein Sald runners tire structure 22 itself may be located approximately every are angular in cross Section to prevent them from turning twenty feet of road length although it will be understood on their axes. that such dimensions may be varied in different circum- 4. A joint structure for use in the pouring of adjacent concrete slabs on a roadbed, said structure comprising:

a pair of spaced runners adapted to be placed on the roadbed transversely of the longitudinal axis of a concrete slab to be poured,

a plurality of spaced dowels each provided with an end socket on each end and adapted to be imbedded in and to extend parallel to the longitudinal axis of the concrete slab when it is poured,

opposed rod support means on said runners having terminal ends seated in said sockets to support said dowels Within said slab when it is poured so that the entire external surface of said dowels is free of contact with said terminal ends and in contact with the slab material,

temporary tie means between opposed rods for maintaining the terminal ends of opposed rod supports seated in said sockets, and

means anchoring each runner to the roadbed whereby said runners are rendered immobile and correspondingly maintain the terminal ends of opposed r-od supports seated in said recess so that said temporary tie means can selectively be removed or retained in place.

5. A device as defined in claim 4 wherein said runners 5 References Cited by the Examiner UNITED STATES PATENTS 2,325,472 7/ 1943 Brickman 94-18 2,462,353 2/1949 Brickman 94-8 10 2,627,793 2/1953 White 94-18 3,045,564 7/1962 Crone 948 3,104,600 9/1963 White 94-17 X References Cited by the Applicant JACOB L. NACKENOFF, Primary Examiner. 

1. IN A JOINT STRUCTURE FOR ADJACENT CONCRETE SLABS, THE COMBINATION OF: A PAIR OF SPACED PARALLEL RUNNERS, A PLURALITY OF UPSTANDING SUPPORT RODS SECURED TO AND SPACED LONGITUDINALLY ON EACH RUNNER, EACH ROD TERMINATING AT ITS TOP IN A HORIZONTAL PROJECTION EXTENDING TOWARD BUT NOT TO THE OTHER RUNNER AND EACH ROD ON EACH RUNNER BEING OPPOSITELY DISPOSED TO A RESPECTIVE ROD ON THE OTHER RUNNER, A PLURALITY OF DOWELS EACH PROVIDED WITH A RECESS IN EACH END, EACH DOWEL SUPPORTED BY A RESPECTIVE PAIR OF SUPPORT RODS AND HAVING ONE OF SAID PRIJECTIONS NESTED IN EACH RECESS, AND TEMPORARY TIE MEANS BETWEEN OPPOSED RODS FOR MAINTAINING THE TERMINAL ENDS OF OPPOSED ROD SUPPORTS SEATED IN SAID RECESSES. 